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{-# LANGUAGE CPP #-}
------------------------------------------------------------------------------
-- |
-- Module: ColorCache
-- Copyright: (c) 2012 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: unportable
-- Created: Mon Sep 10, 2012 00:27
--
--
-- Caching X colors
--
------------------------------------------------------------------------------
#if defined XFT
module ColorCache(withColors, withDrawingColors) where
import MinXft
#else
module ColorCache(withColors) where
#endif
import Data.IORef
import System.IO.Unsafe (unsafePerformIO)
import Control.Monad.Trans (MonadIO, liftIO)
import Control.Exception (SomeException, handle)
import Graphics.X11.Xlib
data DynPixel = DynPixel Bool Pixel
initColor :: Display -> String -> IO DynPixel
initColor dpy c = handle black $ initColor' dpy c
where
black :: SomeException -> IO DynPixel
black = const . return $ DynPixel False (blackPixel dpy $ defaultScreen dpy)
type ColorCache = [(String, Color)]
{-# NOINLINE colorCache #-}
colorCache :: IORef ColorCache
colorCache = unsafePerformIO $ newIORef []
getCachedColor :: String -> IO (Maybe Color)
getCachedColor color_name = lookup color_name `fmap` readIORef colorCache
putCachedColor :: String -> Color -> IO ()
putCachedColor name c_id = modifyIORef colorCache $ \c -> (name, c_id) : c
initColor' :: Display -> String -> IO DynPixel
initColor' dpy c = do
let colormap = defaultColormap dpy (defaultScreen dpy)
cached_color <- getCachedColor c
c' <- case cached_color of
Just col -> return col
_ -> do (c'', _) <- allocNamedColor dpy colormap c
putCachedColor c c''
return c''
return $ DynPixel True (color_pixel c')
withColors :: MonadIO m => Display -> [String] -> ([Pixel] -> m a) -> m a
withColors d cs f = do
ps <- mapM (liftIO . initColor d) cs
f $ map (\(DynPixel _ pixel) -> pixel) ps
#ifdef XFT
type AXftColorCache = [(String, AXftColor)]
{-# NOINLINE xftColorCache #-}
xftColorCache :: IORef AXftColorCache
xftColorCache = unsafePerformIO $ newIORef []
getXftCachedColor :: String -> IO (Maybe AXftColor)
getXftCachedColor name = lookup name `fmap` readIORef xftColorCache
putXftCachedColor :: String -> AXftColor -> IO ()
putXftCachedColor name cptr =
modifyIORef xftColorCache $ \c -> (name, cptr) : c
initAXftColor' :: Display -> Visual -> Colormap -> String -> IO AXftColor
initAXftColor' d v cm c = do
cc <- getXftCachedColor c
c' <- case cc of
Just col -> return col
_ -> do c'' <- mallocAXftColor d v cm c
putXftCachedColor c c''
return c''
return c'
initAXftColor :: Display -> Visual -> Colormap -> String -> IO AXftColor
initAXftColor d v cm c = handle black $ (initAXftColor' d v cm c)
where
black :: SomeException -> IO AXftColor
black = (const $ initAXftColor' d v cm "black")
withDrawingColors :: -- MonadIO m =>
Display -> Drawable -> String -> String
-> (AXftDraw -> AXftColor -> AXftColor -> IO ()) -> IO ()
withDrawingColors dpy drw fc bc f = do
let screen = defaultScreenOfDisplay dpy
colormap = defaultColormapOfScreen screen
visual = defaultVisualOfScreen screen
fc' <- initAXftColor dpy visual colormap fc
bc' <- initAXftColor dpy visual colormap bc
withAXftDraw dpy drw visual colormap $ \draw -> f draw fc' bc'
#endif
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